<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            padding: 0;
            margin: 0;
        }
        .container{
            overflow: hidden;
            display: flex;
            
        }
        .left{
            width: 200px;
            height: 400px;
            background-color: yellowgreen;
        }
        .right{
            flex: 1;
            width: 100%;
            background-color: cyan;
            height: 700px;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="left"></div>
        <div class="right"></div>
    </div>
</body>
</html>